Switchboard signal-light socket and resistance



Oct. 15, 1 929 F. D. WYATT SWITCHBOARD SIGNAL LIGHT SOCKET AND RESISTANCE Filed Dec. 1923 "ilbIllllllllllllllllllllmlllllllfl Patented Oct. 15, 1929 FRANCIS DALE YATT, on CINCINNATI, orrro S'WITCI-IBOARD SIGNALIJGHT 'SQCKET AND RESISTANCE Application filed December 4, Serial No. 678,511.

. -My inventionrelates to switchboard, and more especially to signal or pilot, lights and means and method of attaching same to the board. I also provide meanswhereby I can utilizesmaller voltage lamps, in high voltage circuit, than have heretofore been used.

By my invention I am able to greatly increase the number of lines and signal lights on a switchboard of a given size, over, the number of lights on the switchboards of corresponding size heretofore in use.

Myinvention enables me to dispense with the color lens'heretofore used on a switch- I board as I can color the lamp globe whichis visible'in front of the board.

My invention also provides means whereby I can use lamps of lower voltage than here- I tofore'in the same voltage circuit as heretofore, and obtain increased and more uniform illumination. I I p e In the drawings in which like letters refer to like parts,

Fig. 1 is a side view of a switchboard sec tion showing my invention. i

Fig. 2 is afront View with the lamp removed. i

F ig. 3 is a sectional View through the switchboard, showing my signal lamp and a diagrammatic view of the connecting electrical circuits. I J

I In the drawing A is the panel board, of suitable insulating material, through which is an opening corresponding in size with the outer wall of the metal signal lamp holder or socket and contactBp This lamp holder or socket and contact B, preferably cylindrical in form has in'its wall oppositely arranged channels L to receive the pins on the opposite 7 sides of the lamp. These channels L are so 40 arranged at their inner ends that the lamp maybe turned and the pins will engage/with the channelto lock thelamp in place. The lampis held there by the pressure of the spring Rwhich through contact Qholds the lamp in position in theoff set ends of the channels L. Surrounding the holder B and held on the end of same is a button or guard cap D preferably of insulating material which is held between the panel A and. the end of the holder or socket B by the flange C which engages with a corresponding flange N on the button or guard cap D. By counter-sinking .or guard around the lamp, give a more finished effect to theboard, and insulate the end ofthe holder B. On the opposite end of the holder B, I provide suit-able threads on to which is placed a metal nut ring E which holds the holder B in fixed position in the panel A. Next to themetal nut ring E is a metal washer ring G which is held in contact with nut E a metal lock ring F. Integral with and projecting'out from the washer ring G is a terminal 0 on to which the wire'H is fixed by screw I, nut J and lock nut K.

In'the holder B from a point adjacent to position of the end of the lamp I provide an insulating member M having an opening through its longitudinal center in which is located the terminal stud S; On the front end of the studS,I provide a tube P preferably of brass which is sweated on to the end of the studjS. The edge of this tube isrolled inward so as to form a retaining means for the contact spring R. If desired the stud S and the tube P could be made in one piece. Within the front end of the tube P is arranged the electrical contact Q which is normallyheld forward, so as to make constant contact withthe lamp contact end, by the spiral spring R. The insulatingmember M,

the stud S and the tube P are all held in fixed I position with respect to each otherby the nut Integral with the post S is a post V of smaller diameter upon which is fixed a resistance coil W to the end of which is attached and held fixed the wire X'offthe circuit by washer Y andterminal screw Z. The resistance coilVV is of amaterial having a high temperature coefficient, or ballast resistance,

so that the resistance increases as the current- 'fluctuations in voltage occur. inthe supply circuit. As will be seen from the foregoing the holder or socket B forms one contact and the contact Q in the tube on the end of the stud S forms the other contact for the lamp. The circuit being from the source of supply through wire X terminal Z resistance IV, stud S contact and spring Q, R, lamp and return through socket B washer ring G, terminal 0 to other wire.

Claims- 1. In a device of the character described, a mounting cylinder having its front end portion formed as a receiving socket, a stud witl 1- in the remaining portion of said cylinder, said stud being solid throughout the major portion of its length but having a recess at its forward end, an insulating member extending about said stud within said cylinder, a resilient contact member within said recess and normally protruding beyond the front end of said stud and a resistance mounted on the rear end of said stud, said cylinder extending over said stud to form a rigid mounting for said stud and insulating member.

2. In a device of the class described, a mounting socket having in the forward end portion thereof means to receive and retain the terminal plug portion of an electric lamp, said socket extending rearwardly from said end portion, a stud enclosed by said rearwardly extending portion of said socket, an insulating member approximating the length of said stud, surroundingthe same and centering and retaining said stud in said socket, the rear end of the stud being extended be yond said insulating member and beyond the rear end of the mounting socket, a resist-ance removably mounted on said extended rear end of said stud in close relation to said socket, a nut forming a spacer between the socket and resistance and a resilient contact mounted on the forward end of said stud in position to engage the lamp contact when said lamp is in mounted position.

3. In a panel board mounting, a sleeve adapted to extend transversely entirely through the panel board and having one end portion formed as a receiving socket for an electric lamp, the socket end of said sleeve being provided with a flange adapted to en: gage one side of said panel board, the other end of said sleeve carrying meansadapted to engage the opposite side of said panel board for locking said sleeve in position in said panel board, a stud extending through said sleeve, an insulating member surrounding said stud and centering and supporting the same in said sleeve, and a resistance mounted on the rear end of said stud and a contact on the forward end thereof in a position to engage a lamp contact when such lamp is in mounted position, said stud acting as one conductor and said sleeve acting as the other conductor of the electric circuit.

4. In a panel board mounting, a sleeve adapted to extend transversely entirely through the panel board, said sleeve having one end thereof formed as a receiving socket for an electric lamp, the lamp receiving end being provided with a flange adapted to engage one side of the panel board, the other end of the sleeve carrying means adjust-able thereon to engage the opposite side of the panel board for fixing the sleeve in position in said board, a stud within the sleeve, insulation spacing, the stud from the sleeve, said stud having a threaded portion extending rearwardly a short distance beyond the rear end of the sleeve, a nut on said threaded portion resting against said sleeve, and a resistance coil threaded to said threaded portion of the stud and resting against said nut, said resistance coil, stud, lamp and sleeve being in circuit.

5. In combination with a panel board, a mounting comprising a sleeve of conductive material adapted to extend transversely entirely through the panel board, said sleeve being flanged at one end and externally threaded at the other end, the flanged end of the sleeve being constructed to hold an electric lamp, insulating material snugly secured in the threaded end of said sleeve, a conductive stud extending centrally through the insulating material and projecting a short distance beyond the rear end of the sleeve, the end of the stud toward the lamp being socketed, a contact member slidably and yieldably mounted in said socket, the rearward end of the stud being threaded throughout its projecting portion, a lamp guard held by the flange of the sleeve against one side of the panel board, a pair of nuts on the threaded end of the sleeve one of which rests against the opposite side of the panelboard, a conductive washer held between the nuts and constituting a terminal of the lamp circuit, a resistance coil removably threaded to the proj acting end of the stud and a second terminal of the lamp circuit on the rear end of the coil, a nut on the stud for holding the sleeve, stud and insulation in relative fixed position, said nut constituting also a spacer between the resistance coil and the sleeve.

In testimony whereof, I have signed my name to this specification.

FRANCIS DALE WYATT. 

